Reduction of Intraocular Pressure by Additional Trabeculotomy Ab Externo in Eyes With Primary Open-angle Glaucoma.

Purpose: The purpose of this study was to determine whether a second trabeculotomy (LOT) can reduce the intraocular pressure (IOP) in eyes with primary open-angle glaucoma (POAG) that had undergone an unsuccessful LOT as the initial surgery.

Patients And Methods: LOT ab externo was performed as a second surgery on 37 eyes of 34 POAG patients who had undergone an unsuccessful LOT as the initial surgery. The main outcome measure was the postoperative IOPs, and surgical failures were defined as eyes with a post-LOT IOP>20 mm Hg.